518 FARM AND SCHOOL PROBLEMS. 



in the number of cubic feet of the hay in the mow, and the number of 

 cubic feet in the total number of bales. 



Tanks and Cisterns. 



There are 231 cubic inches in a gallon. 

 There are 31.5 gallons in a barrel. 



PROBLEMS. 



1. A watering tank of galvanized iron, is 3 feet wide, 2 feet high and 

 12 feet long; each end is semicircular in shape; how many barrels 

 of water will it hold? 



2. A tank is 6 feet in diameter and 20 inches deep; inside measure- 

 ments; how many gallons will it hold? 



3. A cement tank is built with walls 6 inches thick, and 18 inches high; 

 how many cubic feet of cement does it contain if the part containing 

 water is a cube? 



4. A cement tank is five feet in diameter inside measurement at the 

 top; the walls at the top are 5 inches thick and the height of the 

 tank outside is 3 feet; the inside surface is in the form of half a 

 sphere; how many barrels of water will it hold and how many 

 cu. feet of cement are there in the walls? 



5. A cistern is to be 56 inches in diameter, how deep must it be to 

 hold 100 barrels of water? 



6. A tank is built of 2 inch plank, with inside measurements of 26 

 inches in depth and 12 feet in diameter; how many square feet of 

 surface are there on the inside surface of the walls? 



Board Measure and Lumber Problems. 



The unit of lumber measure is the "board foot". 



The board foot is an inch in thickness and contains 144 

 cubic inches. 



A board i inch thick, 12 inches long, and 12 inches wide is 

 a board foot. 



The number of feet of lumber in a stick of timber, is there- 

 fore determined by multiplying the number of square feet on 

 one surface by the average thickness in inches. 



If a board is I inch or less in thickness, the number of board 

 feet it contains is the number of square feet on one side of the 

 board. 



